97991731265 has 32 divisors (see below), whose sum is σ = 123191919360. Its totient is φ = 74686639104.

The previous prime is 97991731247. The next prime is 97991731289. The reversal of 97991731265 is 56213719979.

It is a cyclic number.

It is not a de Polignac number, because 97991731265 - 2¹⁴ = 97991714881 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42659597 + ... + 42661893.

It is an arithmetic number, because the mean of its divisors is an integer number (3849747480).

Almost surely, 2^97991731265 is an apocalyptic number.

It is an amenable number.

97991731265 is a deficient number, since it is larger than the sum of its proper divisors (25200188095).

97991731265 is a wasteful number, since it uses less digits than its factorization.

97991731265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641.

The product of its digits is 6429780, while the sum is 59.

The spelling of 97991731265 in words is "ninety-seven billion, nine hundred ninety-one million, seven hundred thirty-one thousand, two hundred sixty-five".